We get free cereal at work and occasionally I have a packet of Alpen in the morning if i've not had much to eat the night before (like last night where I only ate 2 babybels, plus 4 Kronenburgs).
I usually use original Alpen but this morning I took a look at the packet with no added sugar.
With sugar 374 kcal,
Without 375 kcal
Not only are you eating sawdust, but you're not even saving on calorie intake. I don't think it's worth it.